package com.example.jwtdemo.utils;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.JwtBuilder;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import lombok.Getter;
import lombok.Setter;
import org.springframework.boot.context.properties.ConfigurationProperties;

import java.util.Date;
import java.util.Map;
@Getter
@Setter
@ConfigurationProperties("jwt.config")
public class JwtUtils {
    //签名私钥
    private String key;
    //签名的失效时间
    private Long ttl;

    /**
     * 设置token
     * @param id 登录用户id
     * @param name 登录用户名
     * @param map
     * @return
     */
    public String createJwt(String id, String name, Map<String,Object> map){
        //设置失效时间
        long now = System.currentTimeMillis();
        long exp = now + ttl;
        //创建 jwtBuilder
        JwtBuilder jwtBuilder = Jwts.builder()
                                .setId(id)
                                .setSubject(name)
                                .setIssuedAt(new Date())
                                .signWith(SignatureAlgorithm.HS256,key);
        //3.根据map设置claims
        for (Map.Entry<String,Object> entry : map.entrySet()){
            jwtBuilder.claim(entry.getKey(),entry.getValue());
        }
        jwtBuilder.setExpiration(new Date(exp));
        String token = jwtBuilder.compact();
        return token;
    }

    public Claims parseJwt(String token){
        Claims claims = Jwts.parser().setSigningKey(key).parseClaimsJws(token).getBody();
        return claims;
    }
}
